Compare this list of features to any other and you’ll see why MasterTemp is setting a new standard for total value. 4 Very compact design for such a high performance heater allows for smaller overall equipment pads that won’t intrude on your poolscape. 4A fully pre-mixed system with a highly efficient air and gas mixture lets MasterTemp heat up fast. No long waits before enjoying your pool or spa. 4 Compare energy efficiency ratings and you’ll find MasterTemp at the top of the list. Comfort and economy can go together. 4With a hot surface ignition (no pilot light) and pushbutton, digital controls, MasterTemp is as easy to operate as your home heating system. Plus, user-friendly indicator lights make system operation and monitoring a snap. 4The easy-to-view, rotating digital display places controls front and center, no matter how MasterTemp is positioned on your equipment pad. 4 MasterTemp is engineered for super-quiet operation and won’t intrude on your poolside leisure time. 4A tough, rustproof composite exterior handles the heat and weathers the elements. 4 Eco-friendly, MasterTemp is certified for low NOx emissions and outperforms industry standards. 4 Safe operation is assured through a series of features, including; a water pressure switch that senses the pump is running to prevent overheating; high limit switches assure the heater turns off if water temperature exceeds factory- set limits; manual gas shut-off when service is required; stack flue sensor also guards against overheating. 4Approved for installation on combustible surfaces. Don’t be left out in the cold with heaters that don’t measure up to today’s longer list of must-have features. Insist on MasterTemp and you’re insisting on better performance and lifetime value. No matter what your criteria for top performance and value, MasterTemp® meets them all Fast, efficient, compact, quiet, safe and eco-friendly No matter what you’re seeking in your swimming pool heater, MasterTemp® measures up. Compare this list of features to any other and you’ll see why MasterTemp is setting a new standard for total value. 4 Very compact design for such a high performance heater allows for smaller overall equipment pads that won’t intrude on your poolscape. 4A fully pre-mixed system with a highly efficient air and gas mixture lets MasterTemp heat up fast. No long waits before enjoying your pool or spa. 4 Compare energy efficiency ratings and you’ll find MasterTemp at the top of the list. Comfort and economy can go together. 4With a hot surface ignition (no pilot light) and pushbutton, digital controls, MasterTemp is as easy to operate as your home heating system. Plus, user-friendly indicator lights make system operation and monitoring a snap. 4The easy-to-view, rotating digital display places controls front and center, no matter how MasterTemp is positioned on your equipment pad. 4 MasterTemp is engineered for super-quiet operation and won’t intrude on your poolside leisure time. 4A tough, rustproof composite exterior handles the heat and weathers the elements. 4 Eco-friendly, MasterTemp is certified for low NOx emissions and outperforms industry standards. 4 Safe operation is assured through a series of features, including; a water pressure switch that senses the pump is running to prevent overheating; high limit switches assure the heater turns off if water temperature exceeds factory- set limits; manual gas shut-off when service is required; stack flue sensor also guards against overheating. 4Approved for installation on combustible surfaces. Don’t be left out in the cold with heaters that don’t measure up to today’s longer list of must-have features. Insist on MasterTemp and you’re insisting on better performance and lifetime value. Easy to install or retrofit in even the tightest space — models from 200M to 400M BTUs — all measure 21L x 21W x 28H Rotating digital display means more installation options and easier access to view operating information Rustproof, tough composite exterior for long life Available in natural gas and propane models. Pool Sizing* °F Heater Size Heater Size Temperature Change/ Model 200 Model 250/250HD Model 300 Model 400/400HD Model 200 Model 250/250HD Model 300 Model 400/400HD 24 Hrs. Pool Capacity in Gallons Pool Surface Area in Sq. Ft. at 5.5' Depth 5 10 15 20 25 30 35 40 97,383 48,691 32,461 24,346 19,477 16,230 13,912 12,173 121,729 60,864 40,576 30,433 24,346 20,288 17,390 15,216 146,075 73,037 48,692 36,519 29,216 24,345 20,868 18,260 194,766 97,383 64,922 48,691 38,953 32,461 27,824 24,346 2,364 1,182 788 591 473 394 338 295 2,955 1,478 985 739 591 493 423 369 3,546 1,773 1,182 887 710 591 507 443 4,727 2,364 1,576 1,182 945 788 675 591 Spa Sizing* Model Spa Volume (Gallons) 200 300 400 500 600 700 800 900 1,000 Minutes for 30°F Temperature Rise (Heater Input in 1000 BTU/HR) 200 250/250HD 300 400/400HD 18.0 15.8 13.5 9.0 27.0 23.5 20.0 13.0 35.0 30.8 26.5 18.0 44.0 38.5 33.0 22.0 53.0 46.5 40.0 27.0 62.0 54.3 46.5 31.0 71...